Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds valuable behavioral context by stating that has_dates is authoritative and that starts_at and ends_at must be ignored when has_dates is false. It reiterates the closed-world constraint rather than adding new safety details.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is front-loaded with the core purpose and the important has_dates behavior. The sentence about fields, excluded fields, deleted records, and updated-since filtering is somewhat list-like and repeats supported parameters, and the safety sentence partly restates the openWorldHint annotation. Overall it remains clear and reasonably compact.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a read-only list tool with zero required parameters, full schema coverage, annotations, and an output schema, the description provides enough context to call it correctly. It covers special date-field interpretation and filtering capabilities. The main remaining gap is explicit routing versus sibling list/show tools.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, and all four optional parameters are already documented in the input schema. The description mentions fields, excluded fields, deleted records, and updated-since filtering but does not add parameter-level meaning beyond the schema. The has_dates rule concerns response interpretation rather than input parameter semantics.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description states a specific verb and resource: list Tripsy trips the authenticated user follows but is not travelling on. It adds a clear relationship constraint based on current-user is_travelling permission. It does not explicitly distinguish itself from sibling tools such as trips_list or trips_show.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies when to use the tool by specifying followed trips that the user is not travelling on, which is useful context. However, it does not explicitly say when to use a sibling like trips_list instead, nor does it provide exclusions or alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.